/*
   Copyright (c) 2011 Mizar Tools Contributors (mizartools.org)

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
/*  Contributors :
 *	2011-02-05 Marco Riccardi - initial implementation
 *
 */
package org.mizartools.system.xml;

import java.util.LinkedList;

import org.mizartools.system.ElementParseException;
import org.mizartools.system.INode;
import org.mizartools.utility.xml.XMLElement;

public abstract class Justification extends JustifiedProposition {

    private enum MySubclass { ErrorInf, By, From, SkippedProof, Proof,}

    public static boolean isJustification(String className){
        boolean found = false;
        for (MySubclass mySubclass :MySubclass.values()){
            if (mySubclass.name().equals(className)){
                found = true;
                break;
            }
        }
        return found;
    }

    public static Justification newInstance(INode parentNode, LinkedList<XMLElement> xmlElementList) throws ElementParseException {
        XMLElement xmlElement = xmlElementList.peek();
        if (!isJustification(xmlElement.getName())){
            throw new ElementParseException(ElementParseException.NOT_VALID_ELEMENT, "XMLElement is a " + xmlElement.getName() + " not a subclass of Justification", xmlElementList);
        }
        MySubclass mySubclass = MySubclass.valueOf(xmlElement.getName());
        switch (mySubclass) {
        case ErrorInf: return Inference.newInstance(parentNode, xmlElementList);
        case By: return Inference.newInstance(parentNode, xmlElementList);
        case From: return Inference.newInstance(parentNode, xmlElementList);
        case SkippedProof: return SkippedProof.newInstance(parentNode, xmlElementList);
        case Proof: return Proof.newInstance(parentNode, xmlElementList);
        default: throw new ElementParseException(ElementParseException.NOT_VALID_ELEMENT, "XMLElement is a " + xmlElement.getName() + " not a subclass of Justification", xmlElementList);
        }
    }

        public LinkedList<XMLElement> getXMLElementList() {
            if (this instanceof Inference) {
                return ((Inference) this).getXMLElementList();
            } else 
            if (this instanceof SkippedProof) {
                return ((SkippedProof) this).getXMLElementList();
            } else 
            if (this instanceof Proof) {
                return ((Proof) this).getXMLElementList();
            } else 
            return new LinkedList<XMLElement>();
        }
}
